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TCP connection request with MSS 0

Hello,

What should be the behaviour of TcpIp stack if a TCP segment (SYN) with MSS 0 is received?

Should the

1. Connection request be dropped?

2. Connection request accepted with a default value of MSS as 536 (for IPv4)?

3. Accept the connection with MSS = 0, do only one way communication

~ Sandeep

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